Relative to some other nights in this campaign, tonight was not bad.
The sky rapidly improved during evening twilight and the sky was generally
clear until almost 0100 local time. The moon is now quite bright and was
an irritant during observations of early evening objects. A substantial
amount of cirrus arrived from the northwest before 0100 and work had to
continue through the clouds for the rest of the night. Sometimes the cirrus
was thin, but at other times it was thick enough to slow operations by
around a factor of two. The seeing varied between 1.5 and 2.5 arcsec and was
generally better after midnight. A dozen and a half blazars were successfully observed for polarization and photometry was attempted for most objects observed before the serious cirrus moved in.
